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overall your model looks pretty good, you need to increase the lighting significantly, the renderings are too dark.
See link below to mine, I have it on a white background, the toilet itself could have been a little bit lighter but that also depends what type of monitor you look at .
https://www.cgtrader.com/3d-models/interior/bathroom/toilet-002-commercial
Thanks for the comment. I will render the scene again and make the background pure white. I intentionally made the background grey to make it dark. I guess it it became way to dark hehe. Will render preview images brighter from now on. Thank you very much again.